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Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI

Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI. Blackgrass ( Alopercurus myosuroides ). Old Seed Bank. Stochastic Germination. Plants germinating. Stochastic Seed Mortality. Dose- response. Plants surviving. Crop Weed Competition. Crop Weed

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Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI

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  1. Threshold vs. adjusted dosageSvend Christensen and Torben Heisel, DIASMark Paice SRI

  2. Blackgrass (Alopercurus myosuroides)

  3. Old Seed Bank Stochastic Germination Plants germinating Stochastic Seed Mortality Dose- response Plants surviving Crop Weed Competition Crop Weed Competition Seed Production and Dispersal New Seeds Yield Loss Economic Model Cost New Seed Bank Herbicide - use Stochastic Weed Control Stochastic Seed Mortality

  4. Initial Blackgrass Data • Blackgrass density was measured in a 14 m x 14 m grid in a winter barley at Silsoe Research Institute • The model unit was 1 m by 1 m cells • Treatment unit was 4 m by 4 m cells

  5. Spatial weed management of Blackgrass • The threshold algorithm • PC-Plant Protection • DAPS (Decision Algorithm for Patch Spraying)

  6. The Threshold Algorithm If Blackgrass density was higher than 1 plant m-2 A normal dose of 3.5 l ha-1 IPU was applied

  7. PC-Plant Protection A normal dose of 2.1l ha-1 IPU was applied

  8. Input data Output data Point or zone model Competition model PC-Plant Protection Decision model DAPS - Decision Algorithm for Patch Spraying

  9. ResultsSeed Bank

  10. Year 0 Seeds/m2 20 m

  11. Year 1 Year 3 Seeds/m2 Seeds/m2 Year 5 Year 7 Seeds/m2 Seeds/m2 The Threshold Algorithm

  12. Year 1 Year 3 Seeds/m2 Seeds/m2 Year 5 Year 7 Seeds/m2 Seeds/m2 PC-Plant Protection

  13. Year 1 Seeds/m2 Year 3 Year 5 Year 7 Seeds/m2 Seeds/m2 Seeds/m2 Decision algorithm for Patch Spraying

  14. Yield loss (DKK ha-1)

  15. IPU dose (l ha-1)

  16. Cost (DKK ha-1)

  17. Model Assumptions • The size of the treatment area affects the differences between the algorithm • No spatially or temporally depended effect of soil conditions or cultivation factors on seed emergence, crop weed competition or seed production

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